Compiling OpenMP Fortran programs

[Raghu_Reddy]

Suppose I have a FORTRAN file that doesn't have any OpenMP directives, but as a routine that will be called from within OpenMP parallel region.

If is there any difference in compiling the following file with one of these options:

-openmp

-recursive

-auto

If there is a difference, is there any downside to using these in combination (it simplifies some Makefiles).

Thank you

--rr

[jimdempseyatthecove]

I can think of no downside or difference for the code generated for the routine. Be mindful that should the -openmp option reach (be passed through to) the link phase that the OpenMP libraries may be linked in. I assume that your "doesn't have any OpenMP directives" also includes "doesn't call OpenMP library functions" as well. Jim Dempsey

[TimP]

In addition to what Jim said, declaring the procedure RECURSIVE will make it callable in a parallel region, without depending on those options.